The drug prices increased on Jan. 1. The statistics were compiled by global information services company Wolters Kluwer and published by UBS Securities, Reuters reports.

Pfizer is also in the midst of pursuing a $160 billion merger with Ireland-based Allergan — a controversial move that will enable the pharma giant to avoid paying U.S. taxes. If the union – known as a corporate inversion – is successful, Pfizer will move its headquarters overseas and reincorporate with Allergan. The merger would create the biggest drug maker in the world (based on sales).

The cost of Pfizer’s popular erectile dysfunction drug Viagra – which had U.S. sales of $1.1 billion in 2014 – went up by 12.9 percent while pain pill Lyrica – which generated $2.3 billion in 2014 sales – got a 9.4 percent bump in price. The cost of novel breast cancer drug Ibrance, which hit the market last year with a staggering list price of $9,850 per month, was increased by 5 percent.

“Medicines are among the most effective and efficient use of private and public health care dollars,” Pfizer said in an emailed statement to Reuters.

“In recent years, it has been common for drug companies to push through annual price increases in at least the high single digits around Jan. 1 for many brands — and in some cases additional increases throughout the year,” The Wall Street Journal explained.

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